CN103268514B - Radio-frequency recognition system based on SAW technologies - Google Patents
Radio-frequency recognition system based on SAW technologies Download PDFInfo
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- CN103268514B CN103268514B CN201310195896.9A CN201310195896A CN103268514B CN 103268514 B CN103268514 B CN 103268514B CN 201310195896 A CN201310195896 A CN 201310195896A CN 103268514 B CN103268514 B CN 103268514B
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- reader
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- interdigital transducer
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Abstract
The invention discloses a kind of radio-frequency recognition system based on SAW technologies, include SAW ID-tag and supporting reader；SAW ID-tag is made up of substrate, the interdigital transducer being arranged in substrate, repellel；Reader includes control process module, the transmitter module and receiving module that are respectively connected to control process module, while accessing circulator, the dual-mode antenna for accessing circulator, the offer local oscillation signal to transmitter module and the phase-locked loop frequency synthesizer of receiving module of transmitter module and receiving module.
Description
Technical field
The present invention relates to radio-frequency recognition system field, specially a kind of radio-frequency recognition system based on SAW technologies.
Background technology
The RFID system based on IC tag that current positive prevalence is used also has many problems not solve, if any in metal object
When in the complex environments such as body, liquid, high temperature, strong electromagnetic, its information reads difficult, although many companies and research and development institution are directed to
RFID system based on IC tag proposes many improved methods, but the RFID system based on IC tag is still unable to reach well
Recognition performance.
The content of the invention
It is an object of the invention to provide a kind of radio-frequency recognition system based on SAW technologies, to solve prior art radio frequency system
The problem of system is present.
In order to achieve the above object, the technical solution adopted in the present invention is：
Radio-frequency recognition system based on SAW technologies, it is characterised in that：Include SAW ID-tag and supporting reading
Device；
Substrate that the SAW ID-tag is made up of piezoelectric crystal material, the interdigital transducer being arranged in substrate, cloth
Put in substrate and the horizontal repellel in front of interdigital transducer is constituted, two buses of the interdigital transducer are connected respectively
There is antenna, the repellel is made up of multiple horizontal reflection bars in front of interdigital transducer successively that are parallel to each other equidistantly, its
In first it is spaced apart between reflection bar and interdigital transducer,；
The reader include control process module, be respectively connected to control process module transmitter module and receiving module,
The circulator that accesses transmitter module and receiving module simultaneously, the dual-mode antenna for accessing circulator, local oscillation signal is provided to launching mould
The phase-locked loop frequency synthesizer of block and receiving module, wherein control process module are based on FPGA structures by single-chip microcomputer and access single-chip microcomputer
The coding-decoding circuit built is constituted, the input access coding-decoding circuit of the transmitter, transmitter output end access circulator, institute
State the input access circulator of receiver, the output end access coding-decoding circuit of receiver；
Computer sends Card Reader signal to reader, and reader received after Card Reader signal, the dual-mode antenna of reader to
SAW ID-tag sends high-frequency impulse as interrogation pulse, and one of antenna of SAW ID-tag receives reader transmitting
Interrogation pulse, the interrogation pulse being received is transformed into surface acoustic wave by the interdigital transducer of SAW ID-tag, described
Surface acoustic wave propagates to repellel in the substrate surface that piezoelectric crystal material is made, and repellel is anti-to incident surface acoustic wave part
Penetrate, the surface acoustic wave being reflected back returns to interdigital transducer, the surface acoustic wave that interdigital transducer will reflect back into again is transformed into high frequency
Pulse is as transponder pulse, and the transponder pulse is sent to reader by another antenna of SAW ID-tag, so as to read
Read device and receive answer signal.
The described radio-frequency recognition system based on SAW technologies, it is characterised in that：The transmitter module is by modulation circuit and work(
Electric discharge road is constituted, wherein modulation circuit input access coding-decoding circuit, and the output end of modulation circuit accesses the defeated of power amplifier
Enter end, the output end access circulator of power amplifier, the phase-locked loop frequency synthesizer is sent to the modulation circuit of transmitter module
Local oscillation signal.
The described radio-frequency recognition system based on SAW technologies, it is characterised in that：The receiving module by lower frequency changer circuit,
Amplification, low-pass filter circuit, rectification circuit, signal shaping, analog to digital conversion circuit are constituted, and wherein lower frequency changer circuit input is accessed
Circulator, lower frequency changer circuit output end access amplification, low-pass filter circuit input, amplification, low-pass filter circuit output termination
Enter rectification circuit input end, rectification circuit output end access signal shaping, analog to digital conversion circuit input, signal shaping, modulus
Change-over circuit output end accesses coding-decoding circuit, and the phase-locked loop frequency synthesizer sends this to the lower frequency changer circuit of receiving module
Shake signal.
The radio system that the present invention is realized using surface acoustic wave (SAW) technology, it is to be used as identification using SAW device
Label, not only information reads relatively easy realization in complex environment, and requires dc source when overcoming IC chip work
Defect, and security and many card reading efficiencies all have a clear superiority than traditional RFID, obtains the performance of radio-frequency recognition system
To large increase, farthest identification distance can exceed that ten meters.It is very suitable for vehicle and does not stop charging identification system, landmark identification system
System, rolling stock Train number recognition and train accurately stop the systems such as control.
Brief description of the drawings
Fig. 1 is present system theory diagram.
Fig. 2 is SAW ID-tag structural representation of the present invention.
Fig. 3 is reader theory diagram of the present invention.
Fig. 4 is reader structured flowchart of the present invention.
Embodiment
As shown in Figure 1.Based on the radio-frequency recognition system of SAW technologies, include SAW ID-tag and supporting reader；
As shown in Figure 2.Substrate 1 that SAW ID-tag is made up of piezoelectric crystal material, arrangement on the base 1 interdigital are changed
Energy device 2, arrangement are on the base 1 and the horizontal repellel 3 in the front of interdigital transducer 2 is constituted, two buses of interdigital transducer 2
Antenna 4 is connected to, repellel 3 is by multiple horizontal reflection bar structures in front of interdigital transducer successively that are parallel to each other equidistantly
Into, wherein it is spaced apart between first reflection bar and interdigital transducer 2,；
As shown in Figure 3, Figure 4.Reader include control process module, be respectively connected to control process module transmitter module and
Receiving module, while accessing the circulator of transmitter module and receiving module, accessing the dual-mode antenna of circulator, provide local oscillation signal
To transmitter module and the phase-locked loop frequency synthesizer of receiving module, wherein control process module is by single-chip microcomputer and access single-chip microcomputer base
Constituted in the FPGA coding-decoding circuits built, the input access coding-decoding circuit of the transmitter, the access of transmitter output end
Circulator, the input access circulator of the receiver, the output end access coding-decoding circuit of receiver；
Computer sends Card Reader signal to reader, and reader received after Card Reader signal, the dual-mode antenna of reader to
SAW ID-tag sends high-frequency impulse as interrogation pulse, and one of antenna of SAW ID-tag receives reader transmitting
Interrogation pulse, the interrogation pulse being received is transformed into surface acoustic wave by the interdigital transducer of SAW ID-tag, described
Surface acoustic wave propagates to repellel in the substrate surface that piezoelectric crystal material is made, and repellel is anti-to incident surface acoustic wave part
Penetrate, the surface acoustic wave being reflected back returns to interdigital transducer, the surface acoustic wave that interdigital transducer will reflect back into again is transformed into high frequency
Pulse is as transponder pulse, and the transponder pulse is sent to reader by another antenna of SAW ID-tag, so as to read
Read device and receive answer signal.
Transmitter module is made up of modulation circuit and power amplifier, wherein modulation circuit input access coding-decoding circuit, is adjusted
The output end of circuit processed accesses the input of power amplifier, the output end access circulator of power amplifier, the phase-locked loop frequency
Synthesizer sends local oscillation signal to the modulation circuit of transmitter module.
Receiving module is by lower frequency changer circuit, amplification, low-pass filter circuit, rectification circuit, signal shaping, analog to digital conversion circuit
Constitute, wherein lower frequency changer circuit input access circulator, lower frequency changer circuit output end access amplification, low-pass filter circuit input
End, amplification, low-pass filter circuit output end access rectification circuit input end, rectification circuit output end access signal shaping, modulus
Change-over circuit input, signal shaping, analog to digital conversion circuit output end access coding-decoding circuit, the phase-locked loop frequency synthesizer
Local oscillation signal is sent to the lower frequency changer circuit of receiving module.
In the present invention, the repellel for constituting each reflection bar in SAW ID-tag is designed by certain specific rule,
Its reflected signal is set to represent defined coding information, then the reflection high-frequency impulse that reader is received just carries the spy of the article
Delimit the organizational structure code.By demodulation and processing, the purpose of automatic identification is reached.
The operation principle of SAW ID-tag is that surface acoustic wave electronic tag is arranged on identified object, when with
When the identified object of SAW ID-tag enters the effective reading scope of reader, reader Auto-Sensing to surface acoustic wave
The presence of label, sends to SAW ID-tag and instructs, and receives the information returned from SAW ID-tag, so that complete doublet
The automatic identification of body.Because acoustic surface wave propagation speed is low, effective reflected impulse string ability after the time delay by several microseconds
Reader is returned to, in this timing period, the noisy reflection around reader has decayed, so as to inhibit to surface acoustic wave electricity
The interference that the useful signal of subtab is brought.The repellel of SAW ID-tag is considered as the code device as bar code, such as
24 strip label bars can be arranged in repellel region, then echo-signal available 224Individual state, these states represent different volumes respectively
Number the target such as vehicle, container, workpiece, human or animal for identification.
In order to reduce the overall dimensions of SAW ID-tag, analogue simulation piezo-electric crystal substrate is not during present invention design
The property of surface acoustic wave when the allomeric and the different tangential phase allomeric, for selection high frequency stability and high-energy conversion efficiency
Base material provide foundation.High frequency stability and energy conversion efficiency, can be such that SAW ID-tag has more
Compact structure, and then reduce the size of piezoelectric substrate.Optimize the knot of SAW ID-tag interdigital transducer during present invention design
Structure and the frequency characteristic for improving SAW device, design is optimized to interdigital transducer using PGSL algorithms.
In the present invention, the transmitter module of reader is modulated to transmission signal, for transferring data to surface acoustic wave
Label, receiving module receives and demodulates the high-frequency pulse signal from SAW ID-tag.
The control process module of reader is communicated with application systems software, and performs the life that application systems software is sent
Order, the control of control process module and the communication process of label card (main-from principle), while control process module also acts as signal
Coding and decoding function.For complicated system, control process module can also carry out anti-collision algorithm, to SAW ID-tag
The data to be transmitted between read write line are encrypted and decrypted, and carry out the work(of the authentication between transponder and reader
Energy.
In order to complete the task that these are complicated, control process module is owned by microprocessor conduct in most cases
Core component.Data exchange between application systems software and reader is carried out by RS232 or RS485 serial ports.Hair
The interface penetrated between module receiving module and control process module shows the state of high frequency interfaces in binary form.
The complete Card Reader process of reader one is as follows：
（1）Computer sends Card Reader signal to reader.
（2）Transmitter module sends Card Reader order and energy to SAW ID-tag by dual-mode antenna；Surface acoustic wave mark
Label receive the order transmitted after signal by interdigital transducer and repellel processing reader, form the letter such as corresponding card number
Breath, is reflected to dual-mode antenna.
（3）Receiving module is handled the SAW ID-tag reflected signal that reception antenna is received, and forms corresponding number
Word signal is sent to control process module.
（4）The data signal that control process module sends receiving module carries out decoding process, delivers to computer.
Claims (1)
1. the radio-frequency recognition system based on SAW technologies, it is characterised in that：Include SAW ID-tag and supporting reader；
Substrate that the SAW ID-tag is made up of piezoelectric crystal material, the interdigital transducer being arranged in substrate, it is arranged in substrate
The upper and horizontal repellel in front of interdigital transducer is constituted, and two buses of the interdigital transducer are connected to antenna,
The repellel is made up of multiple horizontal reflection bars in front of interdigital transducer successively that are parallel to each other equidistantly, wherein first
It is spaced apart between reflection bar and interdigital transducer；The reader includes control process module, is respectively connected at control
Manage the transmitter module and receiving module of module, while accessing circulator, the receipts of access circulator of transmitter module and receiving module
Send out antenna, provide local oscillation signal to transmitter module and the phase-locked loop frequency synthesizer of receiving module, wherein control process module by
Single-chip microcomputer and access single-chip microcomputer are constituted based on the coding-decoding circuit that FPGA is built, the input access coding-decoding circuit of transmitter,
Transmitter output end accesses circulator, the input access circulator of receiver, the output end access coding-decoding circuit of receiver；
Computer sends Card Reader signal to reader, and reader received after Card Reader signal, and the dual-mode antenna of reader is to surface acoustic wave
Label sends high-frequency impulse as interrogation pulse, and one of antenna of SAW ID-tag receives the inquiry arteries and veins of reader transmitting
Punching, the interrogation pulse being received is transformed into surface acoustic wave, the surface acoustic wave by the interdigital transducer of SAW ID-tag
The substrate surface being made in piezoelectric crystal material propagates to repellel, and repellel is reflected incident surface acoustic wave part, reflection
The surface acoustic wave returned returns to interdigital transducer, and the surface acoustic wave that interdigital transducer will reflect back into again is transformed into high-frequency impulse conduct
Transponder pulse, the transponder pulse is sent to reader by another antenna of SAW ID-tag, so that reader is received
To answer signal；
The transmitter module is made up of modulation circuit and power amplifier, wherein modulation circuit input access coding-decoding circuit, is adjusted
The output end of circuit processed accesses the input of power amplifier, the output end access circulator of power amplifier, the phase-locked loop frequency
Synthesizer sends local oscillation signal to the modulation circuit of transmitter module；
The receiving module is by lower frequency changer circuit, amplification, low-pass filter circuit, rectification circuit, signal shaping, analog to digital conversion circuit
Constitute, wherein lower frequency changer circuit input access circulator, lower frequency changer circuit output end access amplification, low-pass filter circuit input
End, amplification, low-pass filter circuit output end access rectification circuit input end, rectification circuit output end access signal shaping, modulus
Change-over circuit input, signal shaping, analog to digital conversion circuit output end access coding-decoding circuit, the phase-locked loop frequency synthesizer
Local oscillation signal is sent to the lower frequency changer circuit of receiving module；
Interdigital transducer optimizes design using PGSL algorithms；Data exchange between application systems software and reader is logical
Cross RS232 or RS485 serial ports to carry out, the interface between transmitter module receiving module and control process module is by high frequency interfaces
State showed in binary form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310195896.9A CN103268514B (en) | 2013-05-23 | 2013-05-23 | Radio-frequency recognition system based on SAW technologies |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310195896.9A CN103268514B (en) | 2013-05-23 | 2013-05-23 | Radio-frequency recognition system based on SAW technologies |
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| CN103268514A CN103268514A (en) | 2013-08-28 |
| CN103268514B true CN103268514B (en) | 2017-08-25 |
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| CN103593905B (en) * | 2013-10-28 | 2016-05-04 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance RF identification voucher management system and method |
| CN103593906A (en) * | 2013-10-28 | 2014-02-19 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance radio frequency identification ticket management terminal |
| CN103870872B (en) * | 2014-03-18 | 2017-02-15 | 北京无线电计量测试研究所 | Acoustic surface wave pressure sensing label for underground pipes |
| CN104200262A (en) * | 2014-09-09 | 2014-12-10 | 北京中讯四方科技股份有限公司 | Large-capacity surface acoustic wave radio frequency tag |
| CN104296782B (en) * | 2014-10-08 | 2016-08-24 | 南京航空航天大学 | A kind of system and method strengthening surface acoustic wave transducing signal intensity |
| CN105807259A (en) * | 2016-04-19 | 2016-07-27 | 广州三星通信技术研究有限公司 | Indoor positioning system, indoor positioning method and mobile terminals |
| WO2017183888A2 (en) | 2016-04-19 | 2017-10-26 | Samsung Electronics Co., Ltd. | Positioning method and apparatus |
| CN106253874A (en) * | 2016-09-22 | 2016-12-21 | 深圳华远微电科技有限公司 | A kind of RFID chip based on SAW resonator and encapsulating structure thereof |
| CN108241878A (en) * | 2016-12-26 | 2018-07-03 | 航天信息股份有限公司 | A kind of label identification method and equipment |
| CN107688846B (en) * | 2017-07-25 | 2020-07-14 | 浙江海洋大学 | Wireless tag processor |
| CN108809361A (en) * | 2018-07-17 | 2018-11-13 | 中国船舶重工集团公司第七〇九研究所 | A kind of wide bandwidth SAW reader reception device and its method |
| CN112733976B (en) * | 2020-12-18 | 2023-05-09 | 攀枝花容则钒钛有限公司 | Pantograph carbon slide plate abrasion detection system |
| CN113008122A (en) * | 2021-02-01 | 2021-06-22 | 成都柏森松传感技术有限公司 | Wear detection system |
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| CN101593289A (en) * | 2008-05-28 | 2009-12-02 | 北京中食新华科技有限公司 | Passive electronic tag for surface acoustic wave radio frequency identification |
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